Aerial photo taken on April 17, 2018 shows the view of Zhongshan park during a flower appreciation event in Qingdao, east China's Shandong Province. (Xinhua/Guo Xulei)

Aerial photo taken on April 17, 2018 shows the peach blossoms in Zhongshan park during a flower appreciation event in Qingdao, east China's Shandong Province. (Xinhua/Guo Xulei)

Citizens view the cherry blossoms during a flower appreciation event at Zhongshan park in Qingdao, east China's Shandong Province, April 17, 2018. (Xinhua/Li Ziheng)

Aerial photo taken on April 17, 2018 shows the view of cherry blossoms in Zhongshan park during a flower appreciation event in Qingdao, east China's Shandong Province. (Xinhua/Guo Xulei)